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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79ac0aad377a523291be9ae419219d9b6223d5fd6b9541cfb99f73a09d9b790' 
  AND token = 'QLJLX6v/5EUqekaTN84vtc6zzP9wi5P3qsWLrMLjs0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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