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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761ab64ffa5f9eab676496664e1b3664bede04eebbb06cc081838961e36b3072' 
  AND token = 'QxmiyfPVDAZH99Vda8bzSjibVWtkQrt0BdpltrRQ1U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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