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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58878de540262d6ba6bee7dbed9a43d64f4eab3a82cf05cf3bdb8a5a857a38f8' 
  AND token = 'GDqT9Iu5jSpid7li6N9CNQg4qi4ONfZR0FNtifKQF7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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