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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bac91ce0047e458901e154bb4989adf2e9694bfc48dd3fde06e8c1f73ff2ef' 
  AND token = 'j4n1Yk1n7DTkWz+3EmFNYhnrXw3mJM6PPN+QFjiFE3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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