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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57a4af818cd670e0a7f2587d93cd97f284c1bf30bb68d2ab4113004564e43ef' 
  AND token = '1PjrwvCmDJcC+eU5WrNocjecgfnap+pNrCmeCCNHg9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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