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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ddbbb3ca1784de799de0e8ff9d1239c2d70df5e5db1b56046fa0f00f983700' 
  AND token = 'bFQqEGxYzngiQgAnq8z87efV4owz9G7EohgKXMFN290=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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