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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c10a13335c87da5f0ca831aa2fcbf2346c95e3cdd22f8051c05948085194301b' 
  AND token = '23wyUaO9MUMljmXGMpCroZIQXHrpOw6AWwIivAn6eH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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