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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ef9fd237bd500e1765bc57eb3f0ea4f36c4ce60f3d93c552ba0015d680b95e' 
  AND token = 'ERgkJamWu5NzOW7N0Z/jNCMOf4+rICgoach7xtXJTCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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