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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8776683e7e8038d9cab3f3c5b1293e67ea4fe90d59cb55b4dfddbcdae2d16054' 
  AND token = 'k0J8vV3RG78QdkL25BLQ640KJIMSQri71LMKiuNuNKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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