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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73391d6562b32f4ea4998f11433b2cdc37a19c846f8059b913054012a313d68' 
  AND token = 'yPfPbe6VSjWbmEm/se1FjZv2VsWhrAXB1D3gjLY31jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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