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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d930de58043f4fabda45b21493bc8a1a08c8990f9d1ce0c3a867a431b60cedb' 
  AND token = 'IapWjnGr822QYqMwpZQ9uDuf4V2M6XdWt50BImC6mo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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