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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd0b0e16d29efd967b769a9c3e4a2b8631c74f1c32c3928bd1a92cc79b825ab' 
  AND token = 'e0wDGJvKAjnHloF50Ldn8WyKP1leUFwhMIftotCGVc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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