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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42dd2aaf7e6634688b71a99dc02802a69e2cfc46a4b18014969b227e1194a3d2' 
  AND token = 'tlqPGIaEVBzukehpLWibouAvD98XzeZHROm6bft1s+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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