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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa599295971f8a64f7c9060350a76d668473dd1956d5d7abc7e7683aca56e8e' 
  AND token = 'ZsL/r7rjIPRyxWGz14bv8rd58dKd/MyI//60BxwNY+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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