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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03a9b4fbf5284df4666c3524d1c7cc0042917b43aa3832913de7f3bf9cd12ff' 
  AND token = 'QTsmrLBtKcczYwAlR85MT2ubY8vR9acEQqMmBV1h1ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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