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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b874a005d9af36c390d5b7bc53813c721e377918ba5bd2c397c447ef501891' 
  AND token = 'UMLjQ6xNlODj9TSjyfJ7JgItx0W0HafEmwjCPb62zMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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