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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f70fe5bfd3cc7472373259f6c69f79c4ddc9975f206e2a24976683142b9cd1d' 
  AND token = 'EeMwI7pyJuPzD8kfPzNI9/ekywL5unsjtWbpEbM+Iyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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