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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fab92c9517ae935bc9012710f1bed7743a8dac895c1a40afaab46784af2528' 
  AND token = 'qW2BXU7HE/GttoxtP2/5OnB96g3hgs88qs0u5TVHIa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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