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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a442aad9fabd0431508c0c3132a7180c08dbe4125dfcac2604a8e8899e6ba0' 
  AND token = 'dXJsVSmmCZILZqrDWFhYm/JKcR3slC5Xz9MZmsbom+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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