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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1cea7d13fdb52a6ef3428799518897bfcafdcd30736aa1133c5d6326b8b1b6' 
  AND token = 'cFyUNsudfQuIRbI83CpqXI4NGbsFykfTvjgm02BxVnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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