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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19da326a9f7977ce977c8a4746573575d788e55f526d3c4628c33e85ab9da2be' 
  AND token = 'GveIR4dCpXNe0voxZJFSYp/NyHV4UtdGAIc1mDJkLq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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