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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2b3e61e19930253076ba14be16a0bdc6ecd39de65c08fa748446c863098c8a' 
  AND token = 'O71pNoXE1Zq/FcyH7R24c8R5o/Z2TlKARCOl4DwiUfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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