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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb2b02503fc94ada09f37a279d76e0127af5c47385ee266e4d15c78cff111f3' 
  AND token = 'QPkTNpmZrxt7z6/U99LW1MOapDatH9gZSvqNUA8vTU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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