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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418be16de7f2a665d87f185a508b191147ca216bf141a1f6d31f873aec9c8c4e' 
  AND token = 'NteJ9vJO7g2u0gZpUaF7gIeJKBsAxyr5r20PS9qOKoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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