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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea51fdb6adad956cab24d04f1a2208ebbcaf6b0926f30f13cb6c4b8ba62cf695' 
  AND token = '3ADUJCTSB7+iLM6kYJxojd8x9L6yhy8H2/ApnF2aWIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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