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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce96819681c74ac62bf19b47a026195541ca0a5928c585e8befab29eddd60b4e' 
  AND token = '4Bm2jNtlTC0mA5BL6ArrPalfHNdT9xS9vGQcEAcrzTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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