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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a04367c451d62995ba6db81b9ae9f7645d48d4b97be44f73731a4c2d05e74aa' 
  AND token = 'sLF7m+Hcr61FHP235MKxYaYaPu0J2LIkQFsfwN3iMM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}