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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f68b74c094f2ad922dc28cacabe414458078775c1ed1701af04114f5f87188' 
  AND token = 'GNfMPR43uX17M1kqRPE60VDrWjgM2N08JsX/lC4kxO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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