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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941f28e2f766fd0c0d1762418588c6bbfd7fc53edcf6645b03ed1d672c853646' 
  AND token = 'R8kqmsjjOr9raBKwDLPllzaCM2Bh0t811XMYalKCaaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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