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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697f3e07e47834048661dae006a382c537e306d65ffbe5cfcb960ec203b7008b' 
  AND token = 'aMIFVnffDzl4Sw72zeOBPZZeryC43HFw14gU1UkpW8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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