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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986c50b93284b290fcfe93819081699c70999e2a5021b9024d3606e0533ac632' 
  AND token = 'JTmJQ/ZEmtsVAGjMCJUzhOTZA36qIoMZe3taDT5XMVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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