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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f113df7d325cfa5df982eef42335afe5abd9b5f06d0b55ced1bce0d9bebd9db3' 
  AND token = '+NOQX2wjfFClj3jT1KcUB1o8gSW5KiQcdLeAuceG+Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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