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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc772ed82fb56ea9340aa19a425c2a4c4f8320f9dd5e8a761bf870ec36415c8' 
  AND token = 'Q8F3WWQiJYu3b8A+Eqtkea1hFZpGcS5sa4Mha0uoUxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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