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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87138a13395bf797c0178e37e012b7c942e3d772e7d5deaeac7ac1d459b2c19' 
  AND token = 'qKiQQGu0p4EnOMmhXePiq5UMq/9e4ugu1V4skWRjlEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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