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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2762bcb3034e6229d53a9e70dbb48e72ab155a513a380e4ca4b8181dc0ed9829' 
  AND token = 'QUsz6q4xIAmcN0NbrV3zuci1n1u/VOjz3F78Oq25Ld0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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