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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bd6e9366022f49b8c2a115e52d7f8bc8591d543b781a959503e1a1055a03b5' 
  AND token = '/gsaoHykawLF1YonLT3Q6UBciDt8OYbSRAgOkcExwYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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