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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd010e2d47611ac51f3cc2bec4d92ed45983074e6e740810d035530747ba0b8e6' 
  AND token = 'xolhRIvHkmAtQGfHI4N/UCp3MQa5qkkKy17aijgfbcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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