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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7a370ffab77fc81d2b3b1cf0f752e3265e8aacf4223b5fa01e9377fb9671e6' 
  AND token = 'qHjy17R7xa4s7iFL44jbw31KPqkJ7JiCgjMzzUfaEoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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