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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0de90bd3261c0a9f1507cae6705dc9fc82dc01e0d499a3fd93066be9e0eb861' 
  AND token = '7aKh4grctmdu+tgjt5tFKXD9NnlFPPTK/we1g80G+dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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