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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c8d5cbd35394de0f7e7074fda498f6de13cc0e91f738a697a5e4a8285c48b8' 
  AND token = 'bEs9IaZLUOwMmB/DNtdZtimRIkbtFMxHvHan4Kth/IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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