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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08581a1be3fee8f77e32c03c30fecd3718edb20732da3bb95b22cafd0a41b15b' 
  AND token = 'AD3SLLUS2bAw+s/O8joOFKGU+WYsRHAaY/scfBR44nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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