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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9521113fb7577d640e14a07f6d0321417bc6b533658c9db9363b65cdf6d82220' 
  AND token = '/qgNMmWQ1arTeCHNIHDi4u3p8gPn6ecJIQ7RMXrpgQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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