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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c72e72388de702d068c21a5bd074fee24df17e0e265b8b0610135262141e57' 
  AND token = 'Ff2TjJxLVKp9Q0MAaDMiS1ogr35/fx9EGY49n/SsiXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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