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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8243086ded39ac0325c4b70a2083d85bf6ebc91f6fb4955834a17526bed4dc11' 
  AND token = '87yrZLh0Um/Vstz6oEgDG8mc0YhWtQ1WCC3YHnFHhb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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