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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b665e1f109bcc5d29bcdd7fb4692e9af6094e7857c0be87a85664575b372b52' 
  AND token = 'gBE/9heV6HSvQqFwLHblgbHNl7MFM7Qm8rCCKqMFKGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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