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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1a1979a3ca16433dd14bb3d7f8c3f51b918b56ca8be8511b8ae6c3a3e936df' 
  AND token = 'v35AOEcr2e5NDKnwVoS58RkpRFMaBkGin7S0oTVYrf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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