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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd92618332896c3cabf0062fb1b5f4dc9f9c32998f5187bb06069c8ca87db063' 
  AND token = 'SQBvSVDwUpC3DX82892lDaV4Hd1b8KX+lpn51siiWus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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