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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac7ecb230d0fff2186ddea633db03534f4610b896adffc01ee89d9733a17c3b' 
  AND token = 'i+1KfHokWGVMtZYXfA1Y0uPT/NiWr+VP/kUeGJuD/+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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