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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd023764e2e36deec942074128db89202a268c5b9d21bec328b74288e99d4ca5' 
  AND token = 'w+CuEbwP142tSRkVgiZi212p2nYllIpKvffil+eAPV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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