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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7174d882ec5354b37d3435d50ce76405ca5c398b003ca0237d4ade5f108f5827' 
  AND token = 'v/xnZNV5eE41p9NhpdwRf9f8UleMWo1wWcjPIJvl3CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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