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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092a016fbe11dc254da82698c578dd093a2317147831bf202afa5ceef04cde5c' 
  AND token = 'Yqi05O4s9NTYZlPX9ENwAMa6My6PybbfLTQZmUazgHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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