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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcb87787606dae759b020c2030942749a7c33623a7eb7c39e82de1160892dd6' 
  AND token = 'tN6lUrj0g5HCc9HChuQ3SEBR3ml+QiS3CeGg+H5M1HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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