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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26709efb55122d38c1a0ae36600fe2dd4a022c2da9267523fc3cae84f667d43' 
  AND token = 'OcnNCynHDQyj5JbO5Had7g5ytQK1mMESfjBkx9Vgl/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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