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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10712acc2af139c46352d184feda574f44014e3b93ef2995968d9d32cf3e3ebf' 
  AND token = 'eGyRUHe2QO2hTcXpRbMFfW1A8HoYSfM7V+bdgZGcbDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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