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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf3747a5a7972c7c9d21d4fe01977ecc34b0e9f19560c187da9e0e95bd3ff92' 
  AND token = 'dnP5VpWkVePdRaFA3FXEVO4wyt9mlN6prd1MFrqueqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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