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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fdf183dd9b98d72e43b689eae20bc21405670387834957596a1e3cd10faa76' 
  AND token = 'QIz+aeoJRLtMHGo1KaRuIOJcGqPAAA4MLHzuQhCT8+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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